Clive DLJ, Wang J. Synthesis of (±)-Hamigeran B, (−)-Hamigeran B, and (±)-1-epi-Hamigeran B: Use of Bulky Silyl Groups to Protect a Benzylic Carbon−Oxygen Bond from Hydrogenolysis.
J Org Chem 2004;
69:2773-84. [PMID:
15074927 DOI:
10.1021/jo030347v]
[Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Enone 42 was converted into diene 56, which was then subjected to hydrogenation. Use of the tert-butyldimethylsiloxy groups enforces facial selectivity and protects the C(5) oxygen from hydrogenolysis. The resulting product (55) is easily converted into hamigeran B (1), a marine natural product with powerful activity against herpes and polio viruses. Optically pure enone 73 was made by use of a Meyers' auxiliary and converted into (-)-hamigeran B with the natural absolute configuration.
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